1618398 has 24 divisors (see below), whose sum is σ = 3583008. Its totient is φ = 527712.

The previous prime is 1618387. The next prime is 1618399. The reversal of 1618398 is 8938161.

1618398 is a `hidden beast` number, since 1 + 618 + 39 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111 + ... + 1802.

It is an arithmetic number, because the mean of its divisors is an integer number (149292).

2^1618398 is an apocalyptic number.

1618398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1618398 is an abundant number, since it is smaller than the sum of its proper divisors (1964610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1618398 is a wasteful number, since it uses less digits than its factorization.

1618398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968 (or 1965 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1618398 is about 1272.1627254404. The cubic root of 1618398 is about 117.4073027758.

It can be divided in two parts, 1618 and 398, that added together give a triangular number (2016 = T₆₃).

The spelling of 1618398 in words is "one million, six hundred eighteen thousand, three hundred ninety-eight".